Ok, so I had the same problem, what fixed it for me was completely uninstalling java and then re-installing at the spiral knights page on kong. http://www.java.com/en/download/uninstall.jsp link is a guide for windows users to uninstall java.

For me, I meet all the requirements but when I click play now, it freezes my chrome and java crashes. I know i have java up to date and have uninstalled and reinstalled numerous amounts of times. I have tried other browsers like internet explorer with no luck. Any help?

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